Post-edited Mathematical properties of hierarchies of reduced MHD models
Auteurs : Després, Bruno (Auteur de la Conférence)
CIRM (Editeur )
Résumé : Reduced MHD models in Tokamak geometry are convenient simplifications of full MHD and are fundamental for the numerical simulation of MHD stability in Tokamaks. This presentation will address the mathematical well-posedness and the justification of the such models.Codes MSC :
The first result is a systematic design of hierachies of well-posed reduced MHD models. Here well-posed means that the system is endowed with a physically sound energy identity and that existence of a weak solution can be proved. Some of these models will be detailed.
The second result is perhaps more important for applications. It provides understanding on the fact the the growth rate of linear instabilities of the initial (non reduced) model is lower bounded by the growth rate of linear instabilities of the reduced model.
This work has been done with Rémy Sart.
35L65 - Conservation laws
35Q30 - Stokes and Navier-Stokes equations
65M60 - Finite elements, Rayleigh-Ritz and Galerkin methods, finite methods (IVP of PDE)
76W05 - Magnetohydrodynamics and electrohydrodynamics